jus gentiumPronunciation: /ˌdʒʌs ˈdʒɛntɪəm, -ʃɪəm, ˈgɛntɪəm/Definition of jus gentium noun [mass noun] Law international law. Origin:Latin, literally 'law of nations'jus gentium in other Oxford dictionaries Definition of jus gentium in the US English dictionary